New flat-punch indentation creep testing approach for characterizing the local creep properties at high temperatures

Matschkal D, Kolb M, Neumeier S, Gao S, Hartmaier A, Durst K, Göken M (2019)

Publication Type: Journal article

Publication year: 2019

Journal

Materials & Design Elsevier

Book Volume: 183

Article Number: 108090

DOI: 10.1016/j.matdes.2019.108090

Abstract

An indentation creep testing approach has been developed which allows measuring creep properties at high temperatures. In contrast to existing indentation or impression creep experiments, the approach described here allows to achieve a quite high spatial resolution, as flat punch indenters with a diameter of only 20 μm are used. First indentation creep tests have been performed on single crystalline nickel and nickel binary solid solution alloys with Re, Ta or W as alloying elements, respectively. The indentation creep tests have been carried out at a temperature of 650 °C and stress levels in the range of 85 to 400 MPa. Using crystal plasticity finite element modeling, the indentation creep response is converted into equivalent uniaxial creep properties. It is shown that the conversion parameters, evaluated for differently oriented single crystals, can be chosen independently of the creep rate exponent in the power law creep regime. It is found that the indentation creep results agree well with conventional uniaxial creep tests. Furthermore, the results show that Ta is the most effective solid solution strengthener of all tested solid-solution strengtheners at 650 °C because of the large atomic size mismatch, followed by W and Re.

Authors with CRIS profile

Dorothea Matschkal Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Markus Kolb Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Steffen Neumeier Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Mathias Göken Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Additional Organisation(s)

Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Related research project(s)

Nanomechanical and nanometrological characterisation of single-crystalline Ni-base superalloys (A06) (SFB/TRR 103) TRR 103: Vom Atom zur Turbinenschaufel - wissenschaftliche Grundlagen für eine neue Generation einkristalliner Superlegierungen Jan. 1, 2012 - Dec. 31, 2015

Involved external institutions

Ruhr-Universität Bochum (RUB) DE Germany (DE) Technische Universität Darmstadt DE Germany (DE)

How to cite

APA:

Matschkal, D., Kolb, M., Neumeier, S., Gao, S., Hartmaier, A., Durst, K., & Göken, M. (2019). New flat-punch indentation creep testing approach for characterizing the local creep properties at high temperatures. Materials & Design, 183. https://dx.doi.org/10.1016/j.matdes.2019.108090

MLA:

Matschkal, Dorothea, et al. "New flat-punch indentation creep testing approach for characterizing the local creep properties at high temperatures." Materials & Design 183 (2019).

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